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Article
Publication date: 5 January 2010

Meriem Abdellatif, Maria Pietrzak‐David and Ilhem Slama‐Belkhodja

The purpose of this paper is to present a doubly fed induction machine (DFIM) operating in motor mode and supplied by two voltage source inverters (in stator and rotor sides).

Abstract

Purpose

The purpose of this paper is to present a doubly fed induction machine (DFIM) operating in motor mode and supplied by two voltage source inverters (in stator and rotor sides).

Design/methodology/approach

The aim is to analyze the current sensor fault effects on the stator flux‐oriented control according to the current input‐output decoupling. This justifies the necessity of a reconfiguration control in order to satisfy the system service continuity. Also, a theoretical development of sensitivity coefficients gives an idea about control robustness toward a current sensor fault.

Findings

This paper emphasizes the system performance close dependency to the current sensor outputs accuracy. Moreover, simulation results point out the operation system deterioration in case of current sensor fault, which leads in most cases to its shut down in contrast with the industrial expectations. In this paper, the suggested solution is the DFIM speed drive control reconfiguration when a current sensor fault occurs in order to ensure system service continuity. MATLAB‐Simulink simulation results illustrate the system behavior before and after a current sensor fault. System performance preservation is performed after control reconfiguration.

Originality/value

This solution presented in this paper is relevant, especially because of its simplicity.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 29 no. 1
Type: Research Article
ISSN: 0332-1649

Keywords

Article
Publication date: 14 August 2017

Earl Simendinger, Abdul-Nasser El-Kassar, Maria Alejandra Gonzalez-Perez, John Crawford, Stephanie Thomason, Philippe Reynet, Björn Kjellander and Judson Edwards

Determining the attributes of effective business teachers is critical to schools as they strive to attract and retain students, assure learning, obtain and maintain…

Abstract

Purpose

Determining the attributes of effective business teachers is critical to schools as they strive to attract and retain students, assure learning, obtain and maintain reputation and accreditations, and place their alumni in the competitive job market. The purpose of this paper is to examine students and faculty perceptions of teaching effectiveness in five culturally disparate countries: Colombia, France, Lebanon, Sweden, and the USA.

Design/methodology/approach

A survey was designed based on previous research complemented by an extensive literature review as well as personal communications with faculty in different international business schools. The survey considered 39 teaching attributes related to three specific dimensions: class delivery, class preparation and design, and instructional traits and personal characteristics. The survey targeted students and faculty from seven business schools located in five countries.

Findings

This study offers new conceptual and analytical analyses from a cross-country comparative perspective. Rankings of the importance of perceived teaching attributes for both major groups involved in the teaching of business, faculty and students, are reported. The attributes are also ranked by teaching taxonomy and examined across countries.

Practical implications

This study provides practical results that can be useful to instructors wishing to increase their teaching effectiveness and to universities considering revising their student evaluation forms.

Originality/value

This study includes data collected from faculty and students from several schools located in culturally disparate countries and, thus, increases the applicability of the results in a cross-cultural manner and provides implications for practice internationally.

Details

International Journal of Educational Management, vol. 31 no. 6
Type: Research Article
ISSN: 0951-354X

Keywords

Open Access
Article
Publication date: 28 February 2018

David McBride, Nancy Porter, Kirsten Lovelock, Daniel Shepherd, Maria Zubizaretta and James Burch

The purpose of this paper is to describe risk and protective factors for symptoms of post-traumatic stress disorder (PTSD) experienced over a 1.5-year period among both…

3751

Abstract

Purpose

The purpose of this paper is to describe risk and protective factors for symptoms of post-traumatic stress disorder (PTSD) experienced over a 1.5-year period among both frontline and “non-traditional” responders to the 2010 and 2011 earthquakes in Christchurch, New Zealand.

Design/methodology/approach

A longitudinal survey administered to Christchurch workers with referents from the city of Hamilton at 6, 12 and 18 months after the 2011 earthquake. Potential risk and protective determinants were assessed by questionnaire items at baseline and over time, the outcome being PTSD as assessed by the PTSD Checklist-Civilian version. A longitudinal latent class analysis identified groups with similar trajectories of PTSD.

Findings

A total of 226 individuals, 140 (26 per cent) from Christchurch and 86 (16 per cent) from Hamilton, participated at baseline, 180 at 12 and 123 at 18 months, non-traditional responders forming the largest single group. Two latent classes emerged, with PTSD (21 per cent) and without PTSD (79 per cent), with little change over the 18-month period. Class membership was predicted by high scores in the Social Support and Impact of Events scale items, Health-related Quality of Life scores being protective. PTSD scores indicative of distress were found in females, and predicted by burnout risk, behavioural disengagement and venting.

Practical implications

Non-traditional responders should be screened for PTSD. Social support should be considered with the promotion of adaptive coping mechanisms.

Originality/value

The strength was longitudinal follow-up over an 18-month period, with demonstration of how the potential determinants influenced the course of PTSD over time.

Details

Disaster Prevention and Management: An International Journal, vol. 27 no. 2
Type: Research Article
ISSN: 0965-3562

Keywords

Content available
Article
Publication date: 25 January 2011

879

Abstract

Details

Journal of Managerial Psychology, vol. 26 no. 1
Type: Research Article
ISSN: 0268-3946

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